code: def test_load_states_by_steps(self):
      testargs = f"""
          examples/by_feature/checkpointing.py
          --resume_from_checkpoint {os.path.join(self.tmpdir, "step_2")}
          """.split()
      output = run_command(
          self._launch_args + testargs, return_stdout=True
      )
      if torch.cuda.is_available():
          num_processes = torch.cuda.device_count()
      else:
          num_processes = 1
      if num_processes > 1:
          self.assertNotIn("epoch 0:", output)
          self.assertIn("epoch 1:", output)
      else:
          self.assertIn("epoch 0:", output)
          self.assertIn("epoch 1:", output)
  
imports: import ast
  import os
  import re
  import shutil
  import tempfile
  import unittest
  from unittest import mock
  import torch
  from accelerate.test_utils.examples import compare_against_test
  from accelerate.test_utils.testing import TempDirTestCase, require_trackers, run_command, slow
  from accelerate.utils import write_basic_config
label_desc: Use image node_id 6 for calling the FeatureExamplesTests obj's underlying member method code with example usage: obj.test_load_states_by_steps() without return types